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参数资料
| 型号： | IMISG570CYB |
| 厂商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封装： | SSOP-48 |
| 文件页数： | 4/14页 |
| 文件大小： | 176K |
| 代理商： | IMISG570CYB |
SG570
I
2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology
for Pentium Processor Based Designs.
Preliminary
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev.1.1
3/23/98
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Page 12 of 14
CRYSTAL AND REFERENCE OSCILLATOR PARAMETERS
Characteristic
Symbol
Min
Typ
Max
Units
Conditions
Frequency
Fo
12.00
14.31818
16.00
MHz
Tolerence
TC
-
+/-100
PPM
Calibration note 1
TS
-
+/- 100
PPM
Stability (Ta -10 to +60C) note 1
TA
-
5
PPM
Aging (first year @ 25C) note 1
Mode
OM
-
Parallell Resonant
Pin Capacitance
CP
6
pF
Capacitance of XIN and Xout pins
to ground (each)
DC Bias Voltage
VBIAS
0.3Vdd
Vdd/2
0.7Vdd
V
Startup time
Ts
-
30
S
Load Capacitance
CL
-
20
-
pF
the crystals rated load. note 1
Effective Series
resonant
resistance
R1
-
40
Ohms
Power Dissipation
DL
-
0.10
mW
note 1
Shunt Capacitance
CO
-
--
8
pF
crystals internal package
capacitance (total)
For maximum accuracy,the total circuit loading capacitance should be equal to CL. This loading capacitance is the
effective capacitance across the crystal pins and includes the device pin capacitance (CP) in parallel with any circuit
traces, the clock generator and any onboard discrete load capacitors.
Budgeting Calculations
Typical trace capacitance, (< half inch) is 4 pF, Load to the crystal is therefore
2.0 pF
Clock generator internal pin capacitance of 36 pF, Load to the crystal is therefore
3.0 pF
External crystal loading capacitors (connect to ground)
15.0 pF
the total parasitic capacitance would therefore be
= 20.0.0 pF.
Note 1: It is recommended but not mandatory that a crystal meets these specifications.
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